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https://issues.apache.org/jira/browse/FLINK-23310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17377223#comment-17377223
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Shuo Cheng commented on FLINK-23310:
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cc [~qingru zhang]
> Correct the `ModifyKindSetTrait` for `GroupWindowAggregate` when the input is
> an update stream
> -----------------------------------------------------------------------------------------------
>
> Key: FLINK-23310
> URL: https://issues.apache.org/jira/browse/FLINK-23310
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.13.0
> Reporter: Shuo Cheng
> Priority: Minor
> Fix For: 1.14.0
>
>
> Following FLINK-22781, currently group window supports update input stream,
> just like unbounded aggregate, group window may also emit DELETE records, so
> the `ModifyKindSetTrait` for group window should be modified as well.
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